No problem (as long as "later" doesn't mean another 5 months ;) ),
Please keep in mind that this patch allows to run a lot of
debug-register-using guest code that broke so far. So, unless you or
someone else with deep x86 knowledge find issues during that code
inspection, hunting them via concrete test cases may be helpful as well.

Yeah, I think this is reasonable. As long as the patch is well isolated
and easy to identify with a git bisect, I think it's okay.